2
In the context of irrigation water measurement, which of the following equations is used to calculate the flow rate (Q) ina
rectangular channel with known dimensions?
EXPLANATION
Surface Irrigation Engineering
- Manning's Equation for Open Channel Discharge:
- Variables:
- $n$: Manning's roughness coefficient
- $A$: Flow cross-sectional area ($m^2$)
- $R$: Hydraulic radius ($m$, $R = A/P$)
- $S$: Channel bed slope. (Correct answer: Option 4)
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